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This report examines the downstream benefits of retrofitting current building stock on Department of Defense (DOD) installations. A holistic approach is necessary to achieve the objectives laid out by the executive branch to achieve a net-zero emissions building portfolio by 2045. Current procurement standards address this objective with new construction; however, most buildings within the DOD stock were built ahead of these initiatives and 29% have exceeded their life expectancies. Since this represents a large portion of the DOD building stock, priority should be given to building envelope retrofit projects to reduce the thermal demand in a logically sequenced approach toward net-zero goals. These initial steps are necessary to improve efficiencies that will lead to reduced demand and facilitate downstream investments in alternative and reduced-emissions systems. This report utilized a case study done at NPS that highlights the savings achieved from buildings with tight envelopes and investigated funding streams to achieve these goals. Lieutenant, United States Navy Approved for public release. Distribution is unlimited.